Heats of Immersion of Silica-alumina in Nonaqueous Solvents

The heats of immersion of silica gel, alumina, and silica-aluminas in benzene, cyclohexane, and a solution of n-butylamine in benzene have been studied in connection with the acid properties of the surfaces. It was found that n-butylamine interacts more strongly with the surfaces of silica-aluminas than is the case in an aqueous system, which was previously investigated. Further, the interactions of benzene with the surfaces of silica-aluminas were discussed on the basis of the results of the adsorption isotherms of benzene on the surfaces.